20045513 has 8 divisors (see below), whose sum is σ = 21168000. Its totient is φ = 18929808.

The previous prime is 20045507. The next prime is 20045521. The reversal of 20045513 is 31554002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20045513 - 2⁴ = 20045497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20045563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5120 + ... + 8142.

It is an arithmetic number, because the mean of its divisors is an integer number (2646000).

Almost surely, 2^20045513 is an apocalyptic number.

It is an amenable number.

20045513 is a deficient number, since it is larger than the sum of its proper divisors (1122487).

20045513 is a wasteful number, since it uses less digits than its factorization.

20045513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3391.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20045513 is about 4477.2215714659. The cubic root of 20045513 is about 271.6475078179.

Adding to 20045513 its reverse (31554002), we get a palindrome (51599515).

The spelling of 20045513 in words is "twenty million, forty-five thousand, five hundred thirteen".